Hoisting-jack.



PATENTED FEB. 12, 1907.

C. 0. BREWSTER. HOISTING JACK.

APPLICATION FILED JARS, 1906.

1 EE an I EEE rica.

To all whom it may concern;

Be it known and remembered that hereto fore, to wit, on the 17th day ofOctober, A. D. 1904, at, to wit, the city of St. Paul, in the county ofRamsey and State of Minnesota,- the undersigned, (,HARLEs 0. BREws'TER,in-

. vented a new and us eful Hoisting-Jack.

' minating at its lower'extremity by a nut-' My invention relates tothat class of devices usually designated as hoisting-jacks, and has forits ob ect to improve the same in the several particulars hereinafternoted.

The invention consists of the novel devices and combinations hereinafterdescribed,'and defined in the claims.

The invention is illustrated in the accompanying drawings, wherein likecharacters Indicate like parts throughout the several views. I I

Referring to the drawings, Figure 1 is a view in side elevation, showmgthe improved device. Fig. 2 is a view of the said device in frontelevation. F' 3 is a detail in plan, showing the swivelehi head of thejack-screw.

Fig. 4 is a. detail principally in vertical section, but with some partsleft in full, showing a detachable socket and swivel-head and a' portionof-the jack-screw.- Fig. 5 is a bottom plan view of the detachablesocket of the jack-screw.- Fig. 6 is-a pers ective view of the so-callednut-block, an Fig. 7 is aperspective view of the so-called thrust-block.

The numeral 1 indicates the heavy upright column or base of thehoisting-j ack, the same, as shown, being formed by a heavy timber, thelower end of which rests upon a groundengaging base 2. The said column 1.is

formed with vertically-spaced perforations or bolt-seats 3. F

The numeral 4 indicates a channel-shaped so-called thrustblock, which inits upper end is formed with an enlarged interior tersupporting shoulder5. The numeral 6 indicates a nut-block that fits loosely in the upperportion of the thrust-block 4 and rests upon the shoulder 5' thereof. Inhorizontal cross-section the nut-block is approximately -U-shaped, andthe seat therefor in the thrustblock 4 is correspondingly formed, sothat the said nut-block when seated on the shoulder 5 cannot'rotate',but nevertheless ma be sepa-' rated from the said movement.

The numeral 7 indicates a jack-screw that Works with threaded.engagement through the nut-block 6 and at each end is providedthrust-block y lateral Specification of Letters Patent. I Applicationfiled January 5, 1906. Serial No. 294,794.

.column, so that it will be with an angular shank 8, the said twoangular of the samecross-section, so J shanks being that either end isadapted to be inserted into the angular seat of a screw-socket Thisscrew-socket 9 is provided with a swiveled 'Patented Feb. 12, 1907.

head 10 and is formed with diametrical perforations 11, into which theend of a rod or barmay be inserted in order to rotate the jackscrew.

The thrust-block 4 is securely but adjustablyattached to the column 1,and refer ably this is accomplished by a pair 0 laterally-spaced links12 that are pivotally connected to said column by a nutted bolt 13,passed through one or the other of the perforations 3 thereof. As' isevident, the said thrust-block 4; may be secured to the column 1 at anydesired altitude and under downward pressure thereon will, in view ofthe angularity of the links 12, be pressed laterally and fiimly againstthe opposing face of said el'd in a true vertical position or in truealinement with the said column.

Thenumerals 14 and 15 indicate, respec tively, what Idesignate asprimary and secondarv resser-heads. Both of these heads',.as shown, arein the form of rectangular metal frames, having mounted therein rollers16 and 17, respectively. The said rollers are adapted to runagainst thecolumn 1 to reduce friction, and the said heads are arranged to work onopposite sides of said column. The two heads are yieldingly connected bya pair of laterally-spaced links 18, pivotally attached thereto andarranged to embrace the column 1. To the primary head 1.4 is alsopivoted a pair of laterally-spaced anchoring-links 19, that are adaptedto be secured to the column 1 by means of a bolt or pin20. (Shown bydotted lines in Fig. 2.) The primary presser-head 14 rests upon theswivel-head 10, While the device or thing to be lifted may be restedupon the upper end of the presser-head 15. The numeral 21 indithesecondary set-screw 15'and is adapted to prevent slipping of the saidhead with respect cates a set-screw passed through the bottom of saidhead=1,4,' while the numeral 22 indi cates the set-screw'passed throughthe topof to the thing which is being lifted. In 1'.

the dotted lines marked '23 indicates the beam of a building or otherstructure which no It may here bestated that this improved i is assumedas beingrais'ed by the device.

lifting-jack is especially intended for use in lifting or pushingbuildings or other heavy structures or things throug distance or spacewhich is much greater than the length of the jack-screw 7. As isevident, a jack-screw of "weight. hand, may

great length would not have great strength unless made of large diameterand great The column or base 1, on. the other be made of any desiredlength and ofany desired strength.

Figs. 1 and 2 show the jack applied in working position to lift thestructure or thing 23. In starting the jack into action the thrust-block4 is secured low down on the column and that end of the jack-screw which[supported is turned upward,

projects but slightly above the nut-block 6 so that the primary andresse -heads 14 and 15 will besecondary ow down for the proper initial-liftingaction. I Thejack-screwisthen turned and the inverted jack-screwthen bein replaced inworking position, thethrust-blocx v 1 may-be raisedand secured to the column in a such raised} position. Then after having'the nut-block 19- are, by cured to the column 1, as shown by dotteddines injFigs.

and the load mameans of the jac above action and successively reversingthe jack-screw end for end the load may be lifted or pus'he'd the entirelength of the column 1.

until nearly its' entire length'projects above 6 Then theanchoring-links means of the bolt or. pin 20, se-

1 and 2', thereby anchoring the said primary and secondarypresser-hea'ds 14 and their load to the column. This being done, thejack-screw may be loosened up and turned end for end-that is, with itslong prov jecting end downward and its short rejectingpiendturnedupward. The nutlock. 6

turned the jack-screw upward so that it again carries the load the links19 may be attached, be lifted further upward by -screw; By continuingthe he device described would be 0 erative' evenwith'out' the secondarypresseread 15;. but every much better action is obtained by the primaryand secondarythe useof both 'With the said two heads presser-head's.

. connected by links'1'8the weight of the'load 'on t'h'e', secondary-both-ofthe'said heads 14 head 15 causes the'roller of and 15 t.0tightly press; against the column, and thereby per-- fectsthe sald headsfrom falling away from the column-.- g

' In vfactual practice 5 found highly efficient for the purposes hadinview. It .is of course obvious that the device will be found very.serviceable for pushingheavy structures or moving the same n ahorizontal direction, -as well as'in a vertical direction;

-1-. a device of the 1 ombination witlta column or post,-"of a .What Iclaim-is--- kind" described, the

the device has been a a a thrust-block anchored to the thrust-blocksecurable in different positions longitudinally of said column, apresser-head adapted to travel on said column, and a reversiblejack-screw and cooperating nut arrangedto cooperate and resser-head tocause with res set to the former, substantially as described.

-2. In a device combination with a column, of a thrust-block, and .apre'sser-head, means forsecuring said thrust-block and presser-headtosaid column in different positions longitudinally thereof, and areversible jack-screw andcooperating of the kind described, the

with said thrust-block j the latter to travel nut, which nut is adaptedto be seated on said thrust-block either side up, and which screw isadapted to operate on said presserhead when turned either end up,substantially as described.

- 3. In a device of the kind'described, the

combination with a column, of a thrust-block and a resser-head, linksand bolts for an choring said thrust-block and presser-head to saidcolumn in different positions longitudt nally thereof, a displaceableand reversible nut-block seated in said thrust-block, and a jack-screwworking througlrsaid nut-block and adapted to operate onsaidpresser-head when turned either described. a

4.. Ina device of the. kind described, the combination with a column 1,having perforations 3, of a channel-shaped thrust-block 4, links 12 andcooperating bolts 13 adjust'ably securing said thrust-block to saidcolumn 1, a

end up, substantially as.

roversible'nut-block 6 seated in said thrustblock 4, the jack-screw 7working in said nut- 'block and having an angular shank at each end,asocket 9 adapted to receive either an'-- gular end of said jack-screwand provided with a swivele'd .head- 10, a primary presserhead' 14adapied'to rest upon said head 10 and provided with rollers 16, thesecondary resser-head 15 provided with rollers 17, said presser-heads14' and inks 18 connecting 15, and anchoring'links 19 attached to. saidprimaryhead 14 and adaptedito'b'e secured.

